MARINE BOUNDARY LAYER CLOUDS ARE CENTRAL ACTORS IN THE CLIMATE SYSTEM GIVEN THEIR EXTENSIVE COVERAGE ON THE EARTHS SURFACE THEIR ~1- WAY INFLUENCE ON THE RADIATIVE BALANCE (COOLING) AND THEIR INTIMATE COUPLING BETWEEN AIR MOTIONS ANTHROPOGENIC AND NATURAL AEROSOL SOURCES AND PROCESSES WITHIN THE UPPER OCEAN MIXED LAYER. KNOWLEDGE OF HOW MARINE BOUNDARY LAYER (MBL) SHALLOW CUMULUS CLOUDS RESPOND TO CHANGES IN AEROSOL IS CENTRAL TO UNDERSTANDING HOW MBL CLOUDS MODULATE THE CLIMATE SYSTEM. A FREQUENT APPROACH TO INVESTIGATING HOW SULFATE AEROSOL INFLUENCES MBL CLOUDS HAS BEEN TO EXAMINE SULFATE PLUMES EXTENDING DOWNSTREAM OF ACTIVE VOLCANOES ON ISLANDS. THIS APPROACH IS CHALLENGING TO IMPLEMENT IN PRACTICE DUE TO MODIFICATION OF THE AIR MOTIONS IN THE PLUMES DOWNSTREAM OF ISLANDS AND DUE TO THE TENDENCY OF MOST RESEARCHERS TO EXAMINE ONLY LEVEL-2 RETRIEVALS IGNORING THE ACTUAL DATA COLLECTED BY SENSORS SUCH AS MODIS. NEARLY WITHOUT EXCEPTION PAST STUDIES HAVE CONCLUDED THAT SULFATE AEROSOLS HAVE LARGE EFFECTS CONSISTENT WITH THE 1ST AEROSOL INDIRECT EFFECT (AIE). WE REASON THAT IF SUCH EFFECTS ARE AS LARGE AS SUGGESTED IN LEVEL-2 RETRIEVALS EVIDENCE SHOULD ALSO BE PRESENT IN THE RAW MODIS REFLECTANCE DATA AS WELL AS OTHER DATA SOURCES. HERE WE PROPOSE TO BUILD ON OUR RECENTLY PUBLISHED WORK WHERE WE TESTED THAT HYPOTHESIS BY EXPLOITING THE UNIQUE INFORMATION AVAILABLE IN MODIS AND A-TRAIN DATA IN ~600 PASSES OVER MOUNT KILAUEA DURING A 3-YEAR PERIOD. SEPARATING DATA INTO AEROSOL OPTICAL DEPTH (AOD) QUARTILES WE FOUND LITTLE SUPPORT FOR A LARGE 1ST AIE RESPONSE. WE DID FIND AN UNAMBIGUOUS INCREASE IN SUB 1KM-SCALE CLOUD FRACTION WITH AOD. THIS INCREASE IN SUB 1 KM CLOUD FRACTION WAS ENTIRELY CONSISTENT WITH INCREASED REFLECTANCE WITH INCREASING AOD THAT IS USED VIA THE LEVEL 2 RETRIEVALS TO ARGUE FOR A LARGE AIE RESPONSE OF MBL CLOUDS. WHILE THE 1-KM PIXELS BECAME UNAMBIGUOUSLY BRIGHTER THAT BRIGHTENING WAS DUE TO INCREASED SUB 1 KM CLOUD FRACTION AND NOT NECESSARILY DUE TO CHANGES IN PIXEL-LEVEL CLOUD MICROPHYSICS. WE ALSO FOUND THAT MARINE BOUNDARY CLOUD TOP HEIGHTS INCREASE AS DO SURFACE WIND SPEEDS AS AEROSOL INCREASES WHILE THE RADAR REFLECTIVITY FROM CLOUDSAT DOES NOT CHANGE SUBSTANTIALLY. THESE ADDITIONAL RESULTS IMPLY THAT INCREASED AEROSOLS MAY HAVE CAUSED INVIGORATION OF THE MBL CLOUDS WITH LITTLE EFFECT ON PRECIPITATION.